<template xlang="wxml" minapp="mpvue">
	<view class="tki-qrcode">
		<canvas class="tki-qrcode-canvas" :canvas-id="cid" :style="{width:cpSize+'px',height:cpSize+'px'}" />
		<image v-if="show" :src="result" :style="{width:cpSize+'px',height:cpSize+'px'}" />
	</view>
</template>

<script>
	import QRCode from "./qrcode.js"
	let qrcode
	export default {
		name: "tki-qrcode",
		props: {
			cid: {
				type: String,
				default: 'tki-qrcode-canvas'
			},
			size: {
				type: Number,
				default: 200
			},
			unit: {
				type: String,
				default: 'upx'
			},
			show: {
				type: Boolean,
				default: true
			},
			val: {
				type: String,
				default: ''
			},
			background: {
				type: String,
				default: '#ffffff'
			},
			foreground: {
				type: String,
				default: '#000000'
			},
			pdground: {
				type: String,
				default: '#000000'
			},
			icon: {
				type: String,
				default: ''
			},
			iconSize: {
				type: Number,
				default: 40
			},
			lv: {
				type: Number,
				default: 3
			},
			onval: {
				type: Boolean,
				default: false
			},
			loadMake: {
				type: Boolean,
				default: false
			},
			usingComponents: {
				type: Boolean,
				default: true
			},
			showLoading: {
				type: Boolean,
				default: true
			},
			loadingText: {
				type: String,
				default: '二维码生成中'
			},
		},
		data() {
			return {
				result: '',
			}
		},
		methods: {
			_makeCode() {
				let that = this
				if (!this._empty(this.val)) {
					qrcode = new QRCode({
						context: that, // 上下文环境
						canvasId: that.cid, // canvas-id
						usingComponents: that.usingComponents, // 是否是自定义组件
						// loadingText: that.loadingText, // loading文字
						text: that.val, // 生成内容
						size: that.cpSize, // 二维码大小
						background: that.background, // 背景色
						foreground: that.foreground, // 前景色
						pdground: that.pdground, // 定位角点颜色
						correctLevel: that.lv, // 容错级别
						image: that.icon, // 二维码图标
						imageSize: that.iconSize, // 二维码图标大小
						cbResult: function(res) { // 生成二维码的回调
							that._result(res)
						},
					});
				} else {
					uni.showToast({
						title: '二维码内容不能为空',
						icon: 'none',
						duration: 2000
					});
				}
			},
			_clearCode() {
				this._result('')
				qrcode.clear()
			},
			_saveCode() {
				let that = this;
				if (this.result != "") {
					uni.saveImageToPhotosAlbum({
						filePath: that.result,
						success: function() {
							// uni.showToast({
							// 	title: '二维码保存成功',
							// 	icon: 'success',
							// 	duration: 2000
							// });
						}
					});
				}
			},
			_result(res) {
				this.result = res;
				this.$emit('result', res)
			},
			_empty(v) {
				let tp = typeof v,
					rt = false;
				if (tp == "number" && String(v) == "") {
					rt = true
				} else if (tp == "undefined") {
					rt = true
				} else if (tp == "object") {
					if (JSON.stringify(v) == "{}" || JSON.stringify(v) == "[]" || v == null) rt = true
				} else if (tp == "string") {
					if (v == "" || v == "undefined" || v == "null" || v == "{}" || v == "[]") rt = true
				} else if (tp == "function") {
					rt = false
				}
				return rt
			}
		},
		watch: {
			size: function(n, o) {
				if (n != o && !this._empty(n)) {
					this.cSize = n
					if (!this._empty(this.val)) {
						setTimeout(() => {
							this._makeCode()
						}, 100);
					}
				}
			},
			val: function(n, o) {
				if (this.onval) {
					if (n != o && !this._empty(n)) {
						setTimeout(() => {
							this._makeCode()
						}, 0);
					}
				}
			}
		},
		computed: {
			cpSize() {
				if (this.unit == "upx") {
					return uni.upx2px(this.size)
				} else {
					return this.size
				}
			}
		},
		mounted: function() {
			if (this.loadMake) {
				if (!this._empty(this.val)) {
					setTimeout(() => {
						this._makeCode()
					}, 0);
				}
			}
		},
	}
</script>
<style>
	.tki-qrcode {
		position: relative;
	}

	.tki-qrcode-canvas {
		position: fixed;
		top: -99999upx;
		left: -99999upx;
		z-index: -99999;
	}
</style>